الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
To reduce the impact on the environment, industrial and agricultural waste products such as carpet waste, sisal and flax have been added to the concrete. Usage of these materials in concrete does not only improve the tensile strength of concrete such as (The fresh concrete properties (slump test) and the hardened concrete properties compressive strength, unit weight, in Indirect strength, flexural strength , drying Shrinkage, Impact stress, The effect of temperature at ( 200°C,350°C and 500 °C) and Thermal conductivity of Concrete), but also leads to the proper disposal of these materials that leads to reduce the impact on environment. Fiber admixture can effectively improve the mechanical and physical properties of concrete. Utilization of recycled fibers from post-consumer, industrial waste and agricultural waste offer some benefits such as waste reduction, resource conservation, also low-cost materials and reduced need for land filling. Concrete is a tension weak building material, which is often cracked not ridden in plastic and hardened states, drying shrinkage and so on, low tensile strength limited ductility and resistance to cracking. In order to improve attempt has been made to study the effect of these materials on ordinary Portland cement concrete. In the experimental work, glass fibers, sisal, flax and waste carpet fiber in different percentage (0.5%, 1% and 2 %) has been added by volume. The fresh concrete properties (slump test) and the hardened concrete properties compressive strength, unit weight, in Indirect strength, flexural strength , dry Shrinkage, Impact stress, The effect of temperature at ( 200°C,350°C and 500 °C) and Thermal conductivity of Concrete) were carried out. A total of 39 concrete mixtures were performed with different cement contents of 300, 350 and 400 Kg/m3 at water - cement ratio = (0.525, 0.525 and 0.425) Respectively, The amount of water was adjusted according to cement content, The super plasticizer dosage varied from 0.6% to 2.5% of cement content to achieve the required level of workability defined by a slump value of 10± 2cm. The results showed improvement in mechanical and physical properties of concrete with adding (0.5% by volume) of fibers is the best ratio at cement content 350 and 400 kg/m3 and the priority for fibers to be added to concrete were glass fiber , carpet waste, sisal fiber and flax fiber respectively.